Title 26 › Subtitle D — Miscellaneous Excise Taxes › CHAPTER 36 — CERTAIN OTHER EXCISE TAXES › Subchapter A — Harbor Maintenance Tax › § 4462
Sets rules for when a tax applies to loading or unloading commercial cargo at U.S. ports and defines the main words used. Port use means loading or unloading commercial cargo from a commercial vessel. Port means a U.S. channel or harbor that is open to public navigation and not an inland waterway, except places that have had no Federal money used since 1977 or were deauthorized before 1985. For the Columbia River, “port” only includes channels up to the downstream side of the Bonneville lock and dam. Commercial cargo means goods moved on a commercial vessel, including paying passengers, but not bunker fuel, ship’s operational supplies, or fish not yet landed. Commercial vessel means a boat used to move cargo for hire or in the owner’s business, but not ferries that run on a regular daily schedule. Value means the cargo’s usual commercial value or the passenger fare charged. No tax under section 4461(a) applies in many cases: cargo moving between the continental United States and Alaska, Hawaii, or U.S. possessions for use there; cargo loaded and unloaded within the same State or possession; crude oil is excluded from the Alaska rule; and exports are exempt. If vessel fuel is taxed under section 4042, the port-use tax does not apply. The U.S. government is exempt. Customs laws and enforcement apply to this tax as if it were a customs duty, and courts treat it the same for jurisdiction. Only one tax is charged for the same cargo transferred on the same vessel, intraport moves are not taxed, and relay cargo under one bill of lading is taxed only once. Nonprofit or cooperative cargo for certified humanitarian or development aid overseas is exempt. The Secretary may make rules for payment, bonds, practical exemptions, and penalty relief.
Full Legal Text
Internal Revenue Code, Source: USLM XML via OLRC
Legislative History
Reference
Citation
26 U.S.C. § 4462
Title 26, Internal Revenue Code
Last Updated
Sep 22, 2026
Release point: 119-110